body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
ul,
ol,
li,
dl,
dt,
dd,
input{
    margin: 0;
    padding: 0;
}
*{
    /* 内减模式 */
    box-sizing: border-box;
}

body{
    font: 16px/1.5 "Helvetica Neue", Helvetica,Arial, "Microsoft Yahei",
    "Hiragino Sans GB", "Heiti SC", "WenQuanYi Micro Hei", sans-serif;
    color: #333;
}

ul,
ol{
    list-style: none;
}

/* 去除默认的倾斜效果 */
em,
i{
    font-style: normal;
}

/* 去除a 标签默认下划线，文字颜色 */
a{
    text-decoration: none;
    color: #333;
}

/* 设置img的垂直对齐居中方式， 去除img默认间隙 */
img{
    vertical-align: middle;
}
/* 去除input默认的样式 */
input{
    border: none;
    outline: none;
    color: #333;
}

/* 左浮动 */
.fl{
    float: left;
}

/* 右浮动 */
.fr{
    float: right;
}

/* 双伪元素清楚法 */
.clearfix::before,
.clearfix::after{
    content: "";
    display: table;
}
.clearfix::after{
    clear: both;
}